Hinkley, SashaMonnier, J. D.Oppenheimer, Ben RRoberts, Jr., Lewis CZimmerman, NBrenner, DouglasParry, Ian RMartinache, FrantzLai, OlivierSoummer, RemiIreland, Michael2015-12-100004-637Xhttp://hdl.handle.net/1885/66782The nearby star a Oph (Ras Alhague) is a rapidly rotating A5IV star spinning at ∼ 89% of its breakup velocity. This system has been imaged extensively by interferometric techniques, giving a precise geometric model of the star's oblateness and the resulAuthor/s retain copyright201110.1088/0004-637X/726/2/1042015-12-10